package com.java.simple.study.juc.p3.deadlock.v1;

import com.java.simple.study.tool.Sleeper;
import lombok.extern.slf4j.Slf4j;

/**
 * @author zhoujl
 * @date 2022/5/10 21:04
 * @desc
 */
public class TestDeadLock {

    public static void main(String[] args) {
        Chopstick c1 = new Chopstick("c1");
        Chopstick c2 = new Chopstick("c2");
        Chopstick c3 = new Chopstick("c3");
        Chopstick c4 = new Chopstick("c4");
        Chopstick c5 = new Chopstick("c5");

        new Philosopher("苏格拉底", c1, c2).start();
        new Philosopher("柏拉图", c2, c3).start();
        new Philosopher("亚里斯多德", c3, c4).start();
        new Philosopher("赫拉克利克", c4, c5).start();
        //死锁
        //new Philosopher("阿基米德", c5, c1).start();
        // 饥饿
        new Philosopher("阿基米德", c1, c5).start();
    }

}

@Slf4j(topic = "c.Philosopher")
class Philosopher extends Thread {
    private final Chopstick left;
    private final Chopstick right;

    public Philosopher(String name, Chopstick left, Chopstick right) {
        super(name);
        this.left = left;
        this.right = right;
    }

    private void eat() {
        log.debug("eating...");
        Sleeper.sleep(1);
    }

    @Override
    public void run() {
        while (true) {
            // 获得左手筷子
            synchronized (left) {
                // 获得右手筷子
                synchronized (right) {
                    eat();
                }
                // 释放右手筷子
            }
            // 释放左手筷子
        }
    }
}


class Chopstick {
    private final String name;

    public Chopstick(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return "Chopstick{" +
                "name='" + name + '\'' +
                '}';
    }
}
